2680572 - No process found which can be started (scenario '') - SAP S/4HANA CLOUD

Flexible workflow for Purchase Orders is active. When a Purchase order is created error 'No process found which can be started (scenario ' ')' is issued. Similarly when creating or changing a Purchase Order you receive message 'A proper workflow definition could not be found' (Message no. APPL_MM_COMP_WFL028).

•  SAP S/4HANA Cloud Public Edition All versions 

FIORI, MMFIOSTD, SWF_FLEX_RUN004, SWF_FLEX_RUN 004, auto approval, LMEPOFAA, FLEX_WF_SIMULATE, CL_SWF_FLEX_IFS_SIM, CL_SWF_FLEX_RUN_SELECTOR, WS00800238, BUS2012_HD, notification, OLME, Purchase Order, Release Procedure for Purchase Orders, Activate Flexible Workflow for Purchase Orders, Indicator, APPL_MM_COMP_WFL028. , KBA , MM-FIO-PUR-PO-2CL , Fiori UI for Purchase Orders (Public Cloud) , MM-FIO-SRV-2CL , Fiori UI for Services Management (Public Cloud) , How To